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By: Lira-Saldivar, RH - Salas, M. A. - Cruz, J - Coronado, A - Hernández, FD - Guerrero Rodríguez, Eugenio - Gallegos Morales, GabrielType: ArticleIn: Phyton (Buenos Aires)Volume:Series:Issue:Date: 2004-12-01Page Range:Publication Info:Subjects: